(The knots are placed on the sides of the wound to avoid
wound depression. The only exception is during upper lid blepharoplasty
or ptosis operation when a depressed wound is desirable in order to create
the skin crease.The mattress sutures are better than over and over sutures
in ensuring eversion of the wound edge. However, their removal may be difficult
by inexperienced nurses. The semi-mattress sutures reduce the puncture
marks but may not evert the wound effectively.)